What is the main topic of the passage?

One of the main sources for the spreading of news and events through out the world is the newspaper. The purpose of newspaper is to inform the public of political, social, economic and entertainment happenings, among other things. Generally, there are three types of newspapers. Daily newspapers publish at least one edition every weekday. Most dailies also have a weekend edition. Daily newspapers often have sections for news, sports, arts, and entertainment, business, and classified advertising. Weekly newspapers print once a week and cover news of interest to readers in a smaller area than that of a daily paper. They focus on local happenings rather than national or international events. Special-interest newspapers may publish daily, weekly, monthly, or even less frequently. They generally disseminate news of interest to a particular group of readers of feature news about a specific topic.

Thanks to the development of the Internet, we can now get access to electronic newspapers. To some extent, e-newspapers are cheap, up-to-date, and convenient for most readers in the world.
1. What is the main topic of the passage?
A. the importance of newspaper
B. disadvantages of newspaper
C. reading newspaper
D. kinds of newspaper